I would think that when the water line is not connected to a water source that it would drain out the line...if the connection is outside the trailer or inside and lower than the icemaker as well as accessible by the owner. Of course, any water line routed outside the unit will freeze if it still has water in it. I used to use air to empty the water when I had my diesel pusher and never had an issue. Don't have a residental fridge in monte...dang! John
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.